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J. H. CULVER.

Calipers! No. 64,203. Patented April 30, 1867.

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JAMES HENRY GULVER, or SAN FRANCISCO, CALIFORNIA, ASSIGNOR To HIMSELF AND CORNELIUS LEONARD.

Letters Patent No. 64,203, dated April 30; 1867.

IMPROVEMENT IN OALIPERS.

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Be it known thnt I, JAMES H. CULVER, of the city of San Francisco, San Francisco county, State of California, have invented certain new and useful Improvements in Calipers; and I do hereby declare the following description and accompanying drnwings are suflicient to enable any person skilled in tlie art or science to which it most nearly appertnins to innke and use my said invention without further invention or experiment.

The nature of my invention is to provide an improvement in calipers by which the difiiculties met with in obtaining the dimensions of anything, in which the calipers must be changed before they can be removed, are overcome. V,

To more fully explain my invention, reference is hall to the accompanying drawings andletters marked thereon, of which p 1 Figure 1 represents a side elevation of a. pair of calipers oi my invention, showing their application.v

Figure 2, an edge view showingtthe joint.

Figure shows their application as inside ealipersv Similar letters indicate like parts in each of the figures A A are the arms, curved or straight, as most convenient, with a joint at D like ordinary calipers. The leg B is jointed at C, being fixed in position by the tightening-screw a. At the point b, on the inside, the leg or limb 13 makes a right angle, so that it will come in contact with the shoulder 0, thus preventing B from passing a certain limit or point.

When the calipers are used to take an outside measurement, the shouldersb and c are brought together and 'the line B firmly fixed by the set-screw a. The calipers are then applied, as in .fig. 1, and, after ascertaining the size, the screw it is loosened, thus allowing the limb to he turned back to remove the calipers. After removing them, the limb B is moved up far as the shoulders b and c will allow and the set-screw it again tightened, thus securing it in the same place. as before it was removed from the object measured. The same instrument may be used for measuring the inside diameter, as shown in fig. 3.

Having thus described my invention, whet I claim, and desire to secure by Letters Patent, is

A pair of calipers, either for inside or outside measuring, constructed with the joint 0 and shoulders 19 and c, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand and seal.

JAMES H. OULVER. [L. s.]

Witnesses:

G. W. M. SMITH, Geo. H. STRONG. 

